Sewing-machine presser device



. Jam :28, 1930. H; CORRALL ET AL 1,745,152

SEWING MACHINE PRESSER DEVICE Filed May 5, 1927 i l iihiiiiiii PatentedJan. 28, 1930 PATENT OFFICE HERBERT CORRALL, OF OAKFIELD, HELEN BANK,SCOTLAND, ASSIGNORS TO THE SBURGH, AND JAMES I-IEGGIE, OF CLYDE-IVIANUFACTURING COMPANY, OF

ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY SEWING-MACHINEPRESSER DEVICE Application filed May 3, 1927, Serial No. 138,485, and inGreat Britain September 6, 1926.

This invention relates to improvements in sewing machines for fur andglove sewing, being particularly applicable to so-called overhead sewingmachines of the scale-pan type, and aims to provide convenientl operablemeans for varying instantly the pressure exercised on the work sustainedbetween the usual feed cups to take account of changes in the characterof the work being.

stitched.

As is understood, in machines of the type in question, pressure isapplied to the presser or outer feed cup by a spring acting through atrain which usually includes an adjustable screw.

Apart from the loss of time involved in effecting the adjustment of thescrew, which in certain constructions may not be convenient of access,there is experienced the drawback that an adjustment once departed fromby shift of the screw may not be exactly restored when desired.

The invention consists broadly in the inclusion in the train referred toof means, preferably a cam device, instantly shiftable from one toanother of a plurality of predetermined positions each corresponding toa given pressure exercised on the feed cup so that depending on thenumber of stages of movement allowed by the contour of the cam there isavailable to the operator a choice of a range of adjustments instantlyrealized by turning the cam from one predetermined position to another.

The cam may be substantially in the form of a pivoted disk operable by afinger piece and having a cam edge comprising portions unequally spacedfrom the pivotal center, the cam constituting a stop located at a pointof the train convenient to the operator.

Conveniently the cam may be engageable with a plunger guided in a tubebearing on a lever element of the train, the tube and plunger beingsurrounded by a helical spring in compression urging the lever in thedirection to press the outer feed cup towards its fellow feed cup.

The train may include elements in screwthreaded relation with oneanother, permitting of fine adjustment irrespective of the position ofthe cam.

In the accompanying drawings illustrating the preferred embodiment ofthe invention, Fig. 1 is a side elevation, partly in section, of asewing machine embodying the invention. Fig. 2 is a fragmentary rear endview of the machine.

The sewing machine illustrated, which is of the glove and fur sewingtype, comprises a frame 1 in which is mounted the horizontallyreciprocating needle-bar 2 carrying the needle 3 with which the looper tcooperates in the usual manner to form stitches. The needle and looperare actuated by suitable mechanism connected with the main-shaft- 5carrying the hand-wheel 6. The feed-cup 7 is carried by the verticalfeed-shaft 8 to which step-by-step movements are imparted by a suitableclutch-mechanism operated by the link 9 and bellcrank 1-0 receivingmotion from the pitman 11 connected to be operated from the main-shaft5.

The presser-wheel 12 is carried by the overhanging end of thepresser-arm 13 rising from the resser-lever 14; which is fulcrumed onthe usual trunnion-screws 15 within the lower part of the frame 1. ThePresser-lever 14 extends rearwardly through an opening 16 in the machineframe where it is adapted to be engaged by a treadle-operated lever 17to shift the presser-wheel 12 away from the feed-cup 7 for insertion orremoval of work.

Working pressure is applied to the presserwheel by means of thecoil-spring 18 which bears at its lower end upon the presser-lever 14and at its upper end against the head 19 at the upper end of the pin 20which at its lower end enters a sleeve 21 disposed within the spring 18and entering a depression 14; within the presser-lever 14.

Threaded into the frame 1, coaxially with the spring 18 and pin 20, isthe sleeve 22 within which is disposed a slide pin 23 resting upon thepin 20. The sleeve 22 is slotted at its upper end to receive thecam-lever 24 fulcrumed on the screw 25 and having a camedge comprisingfour distinct portions or flats 26 26 26 and 26 disposed atprogressively increased distances from the fulcrumscrew 25. The upperrounded end of the slide-pin 23 engages the cam-edge of the lever 24 anddetermines the degree of compression of the spring 18. It will beunderstood that cam-lever 24 may be instantly turned to bring anyselected one of the flats 26, 26*, 26, 26 to bear upon the slide-pin 23and thus instantly adjustthe pressure of the spring 18 upon theresser-lever to any one of four different pre eterniined Workingpressures.

A fine adjustment irrespective of the position of the cam-lever 2 may beobtained by screwing the threaded sleeve 22 into or out of the frame 1and relocking it in adjusted position by means of the lock-nut 27.

Having thus set forth the nature of the invention, what we claim hereinis:

1. In a machine of the fur and glove sewing type, the combination with afeed-cup, of a presser-cup cooperatively related to the feed-cup, apivoted lever carrying said presser-cup, a spring bearing at one endupon said lever to urge the presser-cup toward the feed-cup, and amanually operated cam acting upon the other end of said spring toinstantly change its working force from one predetermined value toanother.

2. In a machine of the fur and glove type, the combination with theframe and feed-cup, of a presser-cup cooperatively related to thefeed-cup, a pivoted lever carrying said presser-cup, a coil springbearing at one end upon said lever, a sleeve carried by said frame inaxial alinement with and adjacent the other end of said spring, a springcompressing plunger in said sleeve, and a 1nanually operated campivotally mounted on said sleeve for moving said plunger.

In testimony whereof, we have signed our names to this specification.

HERBERT CORRALL. JAMES HEGGIE.

